Detect and prevent DDoS attacks on Citrix ADC via DTLS

Since mid-December the Citrix ADC (Netscaler) gateway on the UDP: 443 – DTLS interface (for EDT) has been under attacked with DDoS ……
How can these attacks be detected and what can be done to avoid that?
On December 24th, Citrix announced in a “Security Bulletin” a DDoS attack pattern that could affect Citrix ADCs.
As part of this attack, attackers can overload the Citrix ADC DTLS network throughput (ADC Out).